| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (rwav.c). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <stdint.h> |
| 25 | #include <stdarg.h> |
| 26 | #include <stddef.h> /* ptrdiff_t on osx */ |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
| 29 | |
| 30 | #include <formats/rwav.h> |
| 31 | |
| 32 | enum |
| 33 | { |
| 34 | ITER_BEGIN, |
| 35 | ITER_COPY_SAMPLES, |
| 36 | ITER_COPY_SAMPLES_8, |
| 37 | ITER_COPY_SAMPLES_16 |
| 38 | }; |
| 39 | |
| 40 | struct rwav_iterator |
| 41 | { |
| 42 | rwav_t *out; |
| 43 | const uint8_t *data; |
| 44 | size_t size; |
| 45 | size_t i, j; |
| 46 | int step; |
| 47 | }; |
| 48 | |
| 49 | void rwav_init(rwav_iterator_t* iter, rwav_t* out, const void* buf, size_t size) |
| 50 | { |
| 51 | iter->out = out; |
| 52 | iter->data = (const uint8_t*)buf; |
| 53 | iter->size = size; |
| 54 | iter->step = ITER_BEGIN; |
| 55 | |
| 56 | out->samples = NULL; |
| 57 | } |
| 58 | |
| 59 | enum rwav_state rwav_iterate(rwav_iterator_t *iter) |
| 60 | { |
| 61 | size_t s; |
| 62 | uint16_t *u16 = NULL; |
| 63 | void *samples = NULL; |
| 64 | rwav_t *rwav = iter->out; |
| 65 | const uint8_t *data = iter->data; |
| 66 | |
| 67 | switch (iter->step) |
| 68 | { |
| 69 | case ITER_BEGIN: |
| 70 | if (iter->size < 44) |
| 71 | return RWAV_ITERATE_ERROR; /* buffer is smaller than an empty wave file */ |
| 72 | |
| 73 | if (data[0] != 'R' || data[1] != 'I' || data[2] != 'F' || data[3] != 'F') |
| 74 | return RWAV_ITERATE_ERROR; |
| 75 | |
| 76 | if (data[8] != 'W' || data[9] != 'A' || data[10] != 'V' || data[11] != 'E') |
| 77 | return RWAV_ITERATE_ERROR; |
| 78 | |
| 79 | if (data[12] != 'f' || data[13] != 'm' || data[14] != 't' || data[15] != ' ') |
| 80 | return RWAV_ITERATE_ERROR; /* we don't support non-PCM or compressed data */ |
| 81 | |
| 82 | if (data[16] != 16 || data[17] != 0 || data[18] != 0 || data[19] != 0) |
| 83 | return RWAV_ITERATE_ERROR; |
| 84 | |
| 85 | if (data[20] != 1 || data[21] != 0) |
| 86 | return RWAV_ITERATE_ERROR; /* we don't support non-PCM or compressed data */ |
| 87 | |
| 88 | if (data[36] != 'd' || data[37] != 'a' || data[38] != 't' || data[39] != 'a') |
| 89 | return RWAV_ITERATE_ERROR; |
| 90 | |
| 91 | rwav->bitspersample = data[34] | data[35] << 8; |
| 92 | |
| 93 | if (rwav->bitspersample != 8 && rwav->bitspersample != 16) |
| 94 | return RWAV_ITERATE_ERROR; /* we only support 8 and 16 bps */ |
| 95 | |
| 96 | rwav->subchunk2size = data[40] | data[41] << 8 | data[42] << 16 | data[43] << 24; |
| 97 | |
| 98 | if ((rwav->subchunk2size < 1) || |
| 99 | (rwav->subchunk2size > iter->size - 44)) |
| 100 | return RWAV_ITERATE_ERROR; /* too few bytes in buffer */ |
| 101 | |
| 102 | samples = malloc(rwav->subchunk2size); |
| 103 | |
| 104 | if (!samples) |
| 105 | return RWAV_ITERATE_ERROR; |
| 106 | |
| 107 | rwav->numchannels = data[22] | data[23] << 8; |
| 108 | rwav->numsamples = rwav->subchunk2size * 8 / rwav->bitspersample / rwav->numchannels; |
| 109 | rwav->samplerate = data[24] | data[25] << 8 | data[26] << 16 | data[27] << 24; |
| 110 | rwav->samples = samples; |
| 111 | |
| 112 | iter->step = ITER_COPY_SAMPLES; |
| 113 | return RWAV_ITERATE_MORE; |
| 114 | |
| 115 | case ITER_COPY_SAMPLES: |
| 116 | iter->i = 0; |
| 117 | |
| 118 | if (rwav->bitspersample == 8) |
| 119 | { |
| 120 | iter->step = ITER_COPY_SAMPLES_8; |
| 121 | |
| 122 | /* TODO/FIXME - what is going on here? */ |
| 123 | case ITER_COPY_SAMPLES_8: |
| 124 | s = rwav->subchunk2size - iter->i; |
| 125 | |
| 126 | if (s > RWAV_ITERATE_BUF_SIZE) |
| 127 | s = RWAV_ITERATE_BUF_SIZE; |
| 128 | |
| 129 | memcpy((void*)((uint8_t*)rwav->samples + iter->i), (void *)(iter->data + 44 + iter->i), s); |
| 130 | iter->i += s; |
| 131 | } |
| 132 | else |
| 133 | { |
| 134 | iter->step = ITER_COPY_SAMPLES_16; |
| 135 | iter->j = 0; |
| 136 | |
| 137 | /* TODO/FIXME - what is going on here? */ |
| 138 | case ITER_COPY_SAMPLES_16: |
| 139 | s = rwav->subchunk2size - iter->i; |
| 140 | |
| 141 | if (s > RWAV_ITERATE_BUF_SIZE) |
| 142 | s = RWAV_ITERATE_BUF_SIZE; |
| 143 | |
| 144 | u16 = (uint16_t *)rwav->samples; |
| 145 | |
| 146 | while (s != 0) |
| 147 | { |
| 148 | u16[iter->j++] = iter->data[44 + iter->i] | iter->data[45 + iter->i] << 8; |
| 149 | iter->i += 2; |
| 150 | s -= 2; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | if (iter->i < rwav->subchunk2size) |
| 155 | return RWAV_ITERATE_MORE; |
| 156 | return RWAV_ITERATE_DONE; |
| 157 | } |
| 158 | |
| 159 | return RWAV_ITERATE_ERROR; |
| 160 | } |
| 161 | |
| 162 | enum rwav_state rwav_load(rwav_t* out, const void* buf, size_t size) |
| 163 | { |
| 164 | enum rwav_state res; |
| 165 | rwav_iterator_t iter; |
| 166 | |
| 167 | iter.out = NULL; |
| 168 | iter.data = NULL; |
| 169 | iter.size = 0; |
| 170 | iter.i = 0; |
| 171 | iter.j = 0; |
| 172 | iter.step = 0; |
| 173 | |
| 174 | rwav_init(&iter, out, buf, size); |
| 175 | |
| 176 | do |
| 177 | { |
| 178 | res = rwav_iterate(&iter); |
| 179 | }while (res == RWAV_ITERATE_MORE); |
| 180 | |
| 181 | return res; |
| 182 | } |
| 183 | |
| 184 | void rwav_free(rwav_t *rwav) |
| 185 | { |
| 186 | free((void*)rwav->samples); |
| 187 | } |